Datasheet

rm [option(s)] file(s) Removes the specified files from the file system.
Directories are not removed by rm unless the option -r is used.
-r Deletes any existing subdirectories
-i Waits for confirmation before deleting each file.
ln [option(s)] sourcefile targetfile
Creates an internal link from the sourcefile to the targetfile. Nor-
mally, such a link points directly to the sourcefile on the same file
system. However, if ln is executed with the -s option, it creates a symbolic
link that only points to the directory in which the sourcefile is located,
enabling linking across file systems.
-s Creates a symbolic link
cd [options(s)] [directory] Changes the current directory; cd without
any parameters changes to the user’s home directory.
mkdir [option(s)] directoryname
Creates a new directory.
rmdir [option(s)] directoryname
Deletes the specified directory, if it is already empty.
chown [option(s)] username.group file(s)
Transfers ownership of a file to the user with the specified user name.
-R Changes files and directories in all subdirectories.
chgrp [option(s)] groupname file(s)
Transfers the group ownership of a given file to the group with the spec-
ified group name. The file owner can only change group ownership if a
member of both the current and the new group.
chmod [options] mode file(s) Changes the access permissions.
The mode parameter has three parts: group, access, and access type.
group accepts the following characters:
u user
g group
o others
272 21.3. Important Linux Commands